Humans aren’t the only mammals without tails - gorillas and chimpanzees don’t have them either. Clearly, we lost our tails during evolution but we still have a tailbone: a triangular structure at the bottom part of the spine, below the sacrum.
Also known as the coccyx, the tailbone comprises four bones which provide attachment for the ligaments and muscles of the pelvic floor. Tailbone injuries can lead to either bruising or fracture in these bones. Apart from severe pain and tenderness, some tailbone injuries can restrict the range of motion of the legs.
Risk factors for tailbone injury include obesity and incorrect posture. Some women may get a tailbone injury while giving birth through vaginal delivery. In fact, women are more prone to tailbone fractures than men.
Treatment options include resting the area, ice application, and making the patient as comfortable as possible. In some cases, doctors may give steroid injections or nerve block to reduce the pain. In patients who don't respond to any of these treatment methods, surgery may be needed to partially or fully remove the tailbone.
Read more: Bone pain: symptoms, causes, diagnosis and treatment